EP 0784729 A1 19970723 - PRESSURE CONVERTER III
Title (en)
PRESSURE CONVERTER III
Title (de)
DRUCKWANDLER
Title (fr)
CONVERTISSEUR DE PRESSION III
Publication
Application
Priority
- NO 9500179 W 19951005
- NO 943857 A 19941012
Abstract (en)
[origin: WO9612083A1] Pressure amplifier for mounting above the drill bit at the lower end of a drill pipe for generating an increased fluid pressure in a drilling fluid flow, for example for obtaining an increased drilling effect. A reciprocating piston (6) in a cylinder (1, 2, 3) at one side (low pressure side) is designed with a large piston area (11), a first, opposite piston area (13) and a second, opposite and relatively small piston area (12) which generates an increased pressure. The valve means (4A-B) control drilling fluid flows to and from the piston. Beyond one end (2) of the cylinder (1, 2, 3) there is provided a hydraulic rotation motor (10) adapted to be driven by the pressure difference between the drilling fluid flows in the drill pipe (1A) and the annulus (50). A transmission mechanism (12, 14A, 14B) is adapted to convert the rotation of the hydraulic motor into intermittent resetting movements in said valve means (4A-B) between two operative positions.
IPC 1-7
IPC 8 full level
E21B 7/18 (2006.01)
CPC (source: EP US)
E21B 7/18 (2013.01 - EP US)
Citation (search report)
See references of WO 9612083A1
Designated contracting state (EPC)
DE FR GB
DOCDB simple family (publication)
WO 9612083 A1 19960425; AU 3711395 A 19960506; EP 0784729 A1 19970723; NO 179879 B 19960923; NO 179879 C 19970108; NO 943857 D0 19941012; NO 943857 L 19960415; US 5924498 A 19990720
DOCDB simple family (application)
NO 9500179 W 19951005; AU 3711395 A 19951005; EP 95934895 A 19951005; NO 943857 A 19941012; US 81708797 A 19970411